Using the magic memory stick and the magic pandora battery
you can Unbrick or Downgrade any  PSP easily.                              
Usage:                          
-Insert Memory Stick into the PSP
- Remove power cord and insert the Pandora Battery into the PSP.
- A menu appears when the PSP boots. Follow the onscreen informationand instructions

You can now use the R4 or the other slot 1 carts to load GBA games in the 3 in 1 expansion pack for EZ V.
BigBoss from the EZ forum has released his program.

The software to do what you want is still in production, but a workable version is availabe from BigBoss
currently: http://www.tabbal.net/copyTest-TR7.zip

Discussion on it is in the thread here:http://ezflash.sosuke.com/post-30693.html#30693

To use it, basically do this:
-Get the program and patch it with the appropriate DLDI for your slot 1 device, and stick it on your microSD card somewhere. Instructions, dldi files and dldi patching programs can be found here:
http://chishm.drunkencoders.com/DLDI/
-Make a folder in the root of your microSD card and name it "GBA" (without quotes)
-Inside that folder, make another and name it "Save" (without quotes) so you now have x:/GBA/Save
-Obtain EZ4 client, and use it to patch your GBA games (GBA homebrew shouldn't need patches)
-put the patched *.gba files into the GBA directory on your microSD
-run the program on your DS, use left/right to pick a file and follow the on screen dialog
-supports 2 banks, 0 and 128 (halfway through the NOR). Press R and L to toggle the bank. Make sure you don't use ROMs larger than 16MB or you will overflow the bank. A to flash as usuall. Note that SRAM will be updated as if it were a single ROM.
-when it is done, turn off your DS, remove the Slot 1 card, turn on your DS and in it's menu press the start GBA button.
-If you want to boot from the slot 1 to the expansion pack use this app:gbaswitch

-When you change to a different game, it should backup the save file to the Save directory you created earlier

Many thanks to BigBoss and cory1492. Without them, this would not be possible.

Sourse: http://gbatemp.net/index.php?showtopic=46742

Volumerate.com is not responsible for this comment. 

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Technical Details

Design - Open-faced

Antenna Type - Internal

Technology
GSM850/800/1900
900/1800/1900 option

*What is GSM? Quick link here.
*What GSM in my country? Quick Link here.

Battery Type - Li-Ion

Talk Time  120-180 mins

Standby Time 200-250 hours

Built-In Digital Camera  1.3 Megapixels

External Memory, 1 GB TF card included

Product pictures and reviews to be continued... 

General: 

GSM-900 and GSM-1800

GSM-900 and GSM-1800 are used in most parts of the world: Europe, Brazil (GSM-850 and 1800), Middle East, Africa and most of Asia.

GSM-850

GSM-850 and GSM-1900 are used in the United States, Canada, and many other countries in the Americas. GSM-850 is also sometimes called GSM-800 because this frequency range was known as the "800MHz Band" when it was first allocated for AMPS usage in the United States in 1983.

GSM-1900

GSM-850 and GSM-1900 are used in the United States, Canada, and many other countries in the Americas.

GSM-450

Another less common GSM version is GSM-450[1]. It uses the same frequency as and can co-exist with old analog NMT systems. NMT is a first generation (1G) mobile phone system which was primarily used in Nordic countries, Eastern Europe and Russia prior to the introduction of GSM.

Detail List:

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